Adds sponsorship levels model
Sponsorship level dashboard
removed donation amount
removed explicit rendering of sponsor levels
Fixed description for social media
Merge pull request #200 from gopesht/add_sponsorship_levels

Adds sponsorship levels
Adds sponsor model
Sponsors dashboard

Removed explicit rendering of sponsors
change start_week.year to start_date.year
Merge pull request #204 from gopesht/adds_sponsors

Adds sponsors
Add social url to conference
Merge pull request #227 from gopesht/social_segment

Add social url to conference
Added sponsor description and email to conference
Adds sponsors to splash
Merge pull request #214 from gopesht/adds_sponsors_to_splash

Adds sponsors to splash
Merge pull request #226 from gopesht/fix_social_media

Fixed description for social media
Adds social media to splash
Merge pull request #233 from gopesht/add_social_to_splash

Adds social media to splash
Fixed conference view spec, mismatched end
event[0].subtitle.blank? instead of .empty? because .blank? for nil is true but .empty? for nil is undefined method
Change wording and use unless instead of if
show cfp partial only if @conference.call_for_papers is not nil